javascript – 我想在ajaxToolkit：AjaxFileUpload开始上传时显示一条消息,有没有办法做到这一点

我想在ajaxToolkit：AjaxFileUpload开始上传时发出消息,有没有办法做到这一点

解决方法:

默认情况下,AjaxFileUpload没有此类事件.但由于AjaxControlToolkit是一个开源库,您可以自己添加它.从此页面下载最近的库源：source codes,找到AjaxFileUpload控件源(/ Server / AjaxControlToolkit / AjaxFileUpload文件夹)并将以下代码添加到AjaxFileUpload.cs文件中：

[DefaultValue("")]
[Category("Behavior")]
[ExtenderControlEvent]
[ClientPropertyName("uploadStarted")]
public string OnClientUploadStarted
{
    get
    {
        return (string)(ViewState["OnClientUploadStarted"] ?? string.Empty);
    }
    set
    {
        ViewState["OnClientUploadStarted"] = value;
    }
}

之后,修改AjaxFileUpload.pre.js文件：

// insert this code right after the _raiseUploadComplete method
add_uploadStarted: function (handler) {
    this.get_events().addHandler("uploadStarted", handler);
},

remove_uploadStarted: function (handler) {
    this.get_events().removeHandler("uploadStarted", handler);
},

_raiseUploadStarted: function () {
    var eh = this.get_events().getHandler("uploadStarted");
    if (eh) {
        eh(this, Sys.EventArgs.Empty);
    }
},

// modify the _doUpload method
_doUpload: function () {

    if (!this._filesInQueue.length || this._filesInQueue.length < 1)
        return;

    this._raiseUploadStarted();

    this._currentQueueIndex = -1;
    if (!this._isFileApiSupports)
        this._createIframe();

    this._processNextFile();
}

比构建解决方案和享受新功能.

标签：jquery,javascript,asp-net,ajaxcontroltoolkit
来源： https://codeday.me/bug/20190626/1289346.html